Squash hybrid PX 13067464

Abstract

The invention provides seed and plants of squash hybrid px 13067464 and the parent lines thereof. The invention thus relates to the plants, seeds and tissue cultures of squash hybrid px 13067464 and the parent lines thereof, and to methods for producing a squash plant produced by crossing such plants with themselves or with another squash plant, such as a plant of another genotype. The invention further relates to seeds and plants produced by such crossing. The invention further relates to parts of such plants, including the fruit and gametes of such plants.

Description

FIELD OF THE INVENTION

The present invention relates to the field of plant breeding and, more specifically, to the development of squash hybrid PX 13067464 and the inbred squash line ZGY 130-1081.

BACKGROUND OF THE INVENTION

The goal of vegetable breeding is to combine various desirable traits in a single variety/hybrid. Such desirable traits may include any trait deemed beneficial by a grower and/or consumer, including greater yield, resistance to insects or disease, tolerance to environmental stress, and nutritional value.

Breeding techniques take advantage of a plant's method of pollination. There are two general methods of pollination: a plant self-pollinates if pollen from one flower is transferred to the same or another flower of the same plant or plant variety. A plant cross-pollinates if pollen comes to it from a flower of a different plant variety.

Plants that have been self-pollinated and selected for type over many generations become homozygous at almost all gene loci and produce a uniform population of true breeding progeny, a homozygous plant. A cross between two such homozygous plants of different genotypes produces a uniform population of hybrid plants that are heterozygous for many gene loci. Conversely, a cross of two plants each heterozygous at a number of loci produces a population of hybrid plants that differ genetically and are not uniform. The resulting non-uniformity makes performance unpredictable.

The development of uniform varieties requires the development of homozygous inbred plants, the crossing of these inbred plants, and the evaluation of the crosses. Pedigree breeding and recurrent selection are examples of breeding methods that have been used to develop inbred plants from breeding populations. Those breeding methods combine the genetic backgrounds from two or more plants or various other broad-based sources into breeding pools from which new lines and hybrids derived therefrom are developed by selfing and selection of desired phenotypes. The new lines and hybrids are evaluated to determine which of those have commercial potential.

One crop species which has been subject to such breeding programs and is of particular value is squash. The term squash is used to refer to four species of the genus Cucurbita of the family Cucurbitaceae: (1) C. maxima, which includes the Hubbard, buttercup, and some large pumpkins, (2) C. mixta, including cushaw squash, (3) C. moschata, which includes the butternut squash, and (4) C. pepo. Acorn squash, zucchini, yellow crookneck and straightneck, and most pumpkins belong to this last species.

The term squash encompasses pumpkins, marrows, and zucchinis. Exclusively ornamental and functional varieties are included among gourds. There is considerable variation in size, shape and color. A typical categorization is to distinguish between summer and winter varieties. Summer squashes include young vegetable marrows, such as zucchini, and are harvested during the summer months. At this stage, the skin of the fruit is tender and the fruit relatively small. Common fruit forms include straightneck, crookneck, saucer shaped, and oblong.

While breeding efforts to date have provided a number of useful squash lines with beneficial traits, there remains a great need in the art for new lines with further improved traits. Such plants would benefit farmers and consumers alike by improving crop yields and/or quality.

SUMMARY OF THE INVENTION

In one aspect, the present invention provides a squash plant of the hybrid designated PX 13067464 and/or the squash line ZGY 130-1081. Also provided are squash plants having all the physiological and morphological characteristics of such a plant. Parts of these squash plants are also provided, for example, including pollen, an ovule, scion, a rootstock, a fruit, and a cell of the plant.

In another aspect of the invention, a plant of squash hybrid PX 13067464 and/or squash line ZGY 130-1081 comprising an added heritable trait is provided. The heritable trait may comprise a genetic locus that is, for example, a dominant or recessive allele. In one embodiment of the invention, a plant of squash hybrid PX 13067464 and/or squash line ZGY 130-1081 is defined as comprising a single locus conversion. In specific embodiments of the invention, an added genetic locus confers one or more traits such as, for example, herbicide tolerance, insect resistance, disease resistance, and modified carbohydrate metabolism. In further embodiments, the trait may be conferred by a naturally occurring gene introduced into the genome of a line by backcrossing, a natural or induced mutation, or a transgene introduced through genetic transformation techniques into the plant or a progenitor of any previous generation thereof. When introduced through transformation, a genetic locus may comprise one or more genes integrated at a single chromosomal location.

The invention also concerns the seed of squash hybrid PX 13067464 and/or squash line ZGY 130-1081. The squash seed of the invention may be provided as an essentially homogeneous population of squash seed of squash hybrid PX 13067464 and/or squash line ZGY 130-1081. Essentially homogeneous populations of seed are generally free from substantial numbers of other seed. Therefore, seed of hybrid PX 13067464 and/or squash line ZGY 130-1081 may be defined as forming at least about 97% of the total seed, including at least about 98%, 99% or more of the seed. The seed population may be separately grown to provide an essentially homogeneous population of squash plants designated PX 13067464 and/or squash line ZGY 130-1081.

In yet another aspect of the invention, a tissue culture of regenerable cells of a squash plant of hybrid PX 13067464 and/or squash line ZGY 130-1081 is provided. The tissue culture will preferably be capable of regenerating squash plants capable of expressing all of the physiological and morphological characteristics of the starting plant, and of regenerating plants having substantially the same genotype as the starting plant. Examples of some of the physiological and morphological characteristics of the hybrid PX 13067464 and/or squash line ZGY 130-1081 include those traits set forth in the tables herein. The regenerable cells in such tissue cultures may be derived, for example, from embryos, meristems, cotyledons, pollen, leaves, anthers, roots, root tips, pistils, flowers, seed and stalks. Still further, the present invention provides squash plants regenerated from a tissue culture of the invention, the plants having all the physiological and morphological characteristics of hybrid PX 13067464 and/or squash line ZGY 130-1081.

In still yet another aspect of the invention, processes are provided for producing squash seeds, plants and fruit, which processes generally comprise crossing a first parent squash plant with a second parent squash plant, wherein at least one of the first or second parent squash plants is a plant of squash line ZGY 130-1081. These processes may be further exemplified as processes for preparing hybrid squash seed or plants, wherein a first squash plant is crossed with a second squash plant of a different, distinct genotype to provide a hybrid that has, as one of its parents, a plant of squash line ZGY 130-1081. In these processes, crossing will result in the production of seed. The seed production occurs regardless of whether the seed is collected or not.

In one embodiment of the invention, the first step in “crossing” comprises planting seeds of a first and second parent squash plant, often in proximity so that pollination will occur for example, mediated by insect vectors. Alternatively, pollen can be transferred manually. Where the plant is self-pollinated, pollination may occur without the need for direct human intervention other than plant cultivation.

A second step may comprise cultivating or growing the seeds of first and second parent squash plants into plants that bear flowers. A third step may comprise preventing self-pollination of the plants, such as by emasculating or removing the male flowers (i.e., killing or removing the pollen or the male flowers).

A fourth step for a hybrid cross may comprise cross-pollination between the first and second parent squash plants. Yet another step comprises harvesting the seeds from at least one of the parent squash plants. The harvested seed can be grown to produce a squash plant or hybrid squash plant.

The present invention also provides the squash seeds and plants produced by a process that comprises crossing a first parent squash plant with a second parent squash plant, wherein at least one of the first or second parent squash plants is a plant of squash hybrid PX 13067464 and/or squash line ZGY 130-1081. In one embodiment of the invention, squash seed and plants produced by the process are first generation (F₁) hybrid squash seed and plants produced by crossing a plant in accordance with the invention with another, distinct plant. The present invention further contemplates plant parts of such an F₁ hybrid squash plant, and methods of use thereof. Therefore, certain exemplary embodiments of the invention provide an F₁ hybrid squash plant and seed thereof.

In still yet another aspect, the present invention provides a method of producing a plant derived from hybrid PX 13067464 and/or squash line ZGY 130-1081, the method comprising the steps of: (a) preparing a progeny plant derived from hybrid PX 13067464 and/or squash line ZGY 130-1081, wherein said preparing comprises crossing a plant of the hybrid PX 13067464 and/or squash line ZGY 130-1081 with a second plant; and (b) crossing the progeny plant with itself or a second plant to produce a seed of a progeny plant of a subsequent generation. In further embodiments, the method may additionally comprise: (c) growing a progeny plant of a subsequent generation from said seed of a progeny plant of a subsequent generation and crossing the progeny plant of a subsequent generation with itself or a second plant; and repeating the steps for an additional 3-10 generations to produce a plant derived from hybrid PX 13067464 and/or squash line ZGY 130-1081. The plant derived from hybrid PX 13067464 and/or squash line ZGY 130-1081 may be an inbred line, and the aforementioned repeated crossing steps may be defined as comprising sufficient inbreeding to produce the inbred line. In the method, it may be desirable to select particular plants resulting from step (c) for continued crossing according to steps (b) and (c). By selecting plants having one or more desirable traits, a plant derived from hybrid PX 13067464 and/or squash line ZGY 130-1081 is obtained which possesses some of the desirable traits of the line/hybrid as well as potentially other selected traits.

In certain embodiments, the present invention provides a method of producing food or feed comprising: (a) obtaining a plant of squash hybrid PX 13067464 and/or squash line ZGY 130-1081, wherein the plant has been cultivated to maturity, and (b) collecting at least one squash from the plant.

In still yet another aspect of the invention, the genetic complement of squash hybrid PX 13067464 and/or squash line ZGY 130-1081 is provided. The phrase “genetic complement” is used to refer to the aggregate of nucleotide sequences, the expression of which sequences defines the phenotype of, in the present case, a squash plant, or a cell or tissue of that plant. A genetic complement thus represents the genetic makeup of a cell, tissue or plant, and a hybrid genetic complement represents the genetic make up of a hybrid cell, tissue or plant. The invention thus provides squash plant cells that have a genetic complement in accordance with the squash plant cells disclosed herein, and seeds and plants containing such cells.

Plant genetic complements may be assessed by genetic marker profiles, and by the expression of phenotypic traits that are characteristic of the expression of the genetic complement, e.g., isozyme typing profiles. It is understood that hybrid PX 13067464 and/or squash line ZGY 130-1081 could be identified by any of the many well known techniques such as, for example, Simple Sequence Length Polymorphisms (SSLPs) (Williams et al., 1990), Randomly Amplified Polymorphic DNAs (RAPDs), DNA Amplification Fingerprinting (DAF), Sequence Characterized Amplified Regions (SCARs), Arbitrary Primed Polymerase Chain Reaction (AP-PCR), Amplified Fragment Length Polymorphisms (AFLPs) (EP 534 858, specifically incorporated herein by reference in its entirety), and Single Nucleotide Polymorphisms (SNPs) (Wang et al., 1998).

In still yet another aspect, the present invention provides hybrid genetic complements, as represented by squash plant cells, tissues, plants, and seeds, formed by the combination of a haploid genetic complement of a squash plant of the invention with a haploid genetic complement of a second squash plant, preferably, another, distinct squash plant. In another aspect, the present invention provides a squash plant regenerated from a tissue culture that comprises a hybrid genetic complement of this invention.

In still yet another aspect, the invention provides a plant of an hybrid squash that exhibits a combination of traits comprising: a grey zucchini-type hybrid squash, with multiple virus resistance; improved yield potential; intermediate resistance to powdery mildew (Podosphaera xanthii).

In still yet another aspect, the invention provides a method of determining the genotype of a plant of squash hybrid PX 13067464 and/or squash line ZGY 130-1081 comprising detecting in the genome of the plant at least a first polymorphism. The method may, in certain embodiments, comprise detecting a plurality of polymorphisms in the genome of the plant. The method may further comprise storing the results of the step of detecting the plurality of polymorphisms on a computer readable medium. The invention further provides a computer readable medium produced by such a method.

In particular embodiments of the invention, a plant or any trait thereof may be described in terms of a color value(s) on the Royal Horticultural Society (RHS) color chart. This chart and the use thereof are well known in the art. It is further well known to those of skill in the art that other systems of color assessment are available and may be used to describe color in connection with any particular plant or trait thereof, including those described herein.

Any embodiment discussed herein with respect to one aspect of the invention applies to other aspects of the invention as well, unless specifically noted.

The term “about” is used to indicate that a value includes the standard deviation of the mean for the device or method being employed to determine the value. The use of the term “or” in the claims is used to mean “and/or” unless explicitly indicated to refer to alternatives only or the alternatives are mutually exclusive. When used in conjunction with the word “comprising” or other open language in the claims, the words “a” and “an” denote “one or more,” unless specifically noted otherwise. The terms “comprise,” “have” and “include” are open-ended linking verbs. Any forms or tenses of one or more of these verbs, such as “comprises,” “comprising,” “has,” “having,” “includes” and “including,” are also open-ended. For example, any method that “comprises,” “has” or “includes” one or more steps is not limited to possessing only those one or more steps and also covers other unlisted steps. Similarly, any plant that “comprises,” “has” or “includes” one or more traits is not limited to possessing only those one or more traits and covers other unlisted traits.

Other objects, features and advantages of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and any specific examples provided, while indicating specific embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.

DETAILED DESCRIPTION OF THE INVENTION

The invention provides methods and compositions relating to plants, seeds and derivatives of squash hybrid PX 13067464 and squash line ZGY 130-1081. The hybrid PX 13067464 is produced by the cross of parent lines ZGY 130-1081 and ZGY 130-1005. The parent lines show uniformity and stability within the limits of environmental influence. By crossing the parent lines, uniform seed hybrid PX 13067464 can be obtained.

The development of squash hybrid PX 13067464 and its parent lines can be summarized as follows.

A. Origin and Breeding History of Squash Hybrid PX 13067464

The parents of hybrid PX 13067464 are ZGY 130-1081 and ZGY 130-1005. These parents were created as follows:

ZGY 130-1081 was derived from an initial cross made between line CAS-48-1042 (a uniform proprietary breeding line owned by Seminis Vegetable Seed) and the F4 generation breeding line ((Q58DA/FW1)/0ZHP204)-1-6-1-2 (also a proprietary breeding line owned by Seminis Vegetable Seed).

The parent CAS-48-1042 produces long striped fruit, in a late harvest, with intermediate resistance documented (in prior generations) to some strains of ZYMV (Zucchini Yellow Mosaic Virus), WMV (Watermelon Mosaic Virus), and PM (Powdery Mildew caused by Podosphaera xanthii). The parent ((Q58DA/FW1)/0ZHP204)-1-6-1-2 produces light colored grey zucchini type fruits with intermediate resistance documented (in prior generations) to some strains of ZYMV (Zucchini Yellow Mosaic Virus), WMV (Watermelon Mosaic Virus), and SqLCV (Squash Leaf Curl Virus).

Both parental lines were derived from many generations of cross and self pollination in various locations, and the initial source of the desirable disease resistance traits found in these proprietary materials traces back to public germplasm distributions by INRA (the French National Institute for Agricultural Research, in the case of CAS 48-1042), Cornell University (distributions by Henry Munger prior to 1988), and UNISON (Universidad de Sonora, Hermosillo Mexico, prior to 2002). Common cultivated landraces of squash used in the development of these parental lines include selections from North Africa, Mexico, and Italy.

The initial cross was made in year 1 at the discretion of the inventor to optimize the combination of desirable traits after observing an individual F4 plant of the male parent showing early harvest and freedom from infection with PRSV (Papaya Ringspot Virus) which was ubiquitous in this particular field. F1 hybrid seed was collected from this cross and sown. This hybrid was observed to be uniform for striped fruit of intermediate length and was self pollinated. F2 generation seeds were sown in year 2, where seedlings were field-inoculated with a cocktail including ZYMV, WMV, and PRSV. Survivors showing the grey zucchini fruit coloration phenotype (lack of stripes) were selected and self pollinated, and the F3 generation seeds were then sown later in year 2 in a location known for high natural rates of infection with Squash Leaf Curcl Virus (SqLV). The F3 selections were noted as particularly early maturing, and once again self pollinated. In year 3, F4 seedlings were inoculated with a cocktail including ZYMV and PRSV to confirm resistance, and separately with an inoculum containing SqLCV. Survivors from this screen were selected and self pollinated. In year 3, the F5 generation seedlings were inoculated with a cocktail including ZYMV, WMV, and PRSV, and they were shown to be uniformly resistant—no segregation was observed in their resistance reaction. Self pollinated survivors from this screen were used to create the F6 generation, which was sown in year 4 for confirmation of uniformity and increase of seed stocks (without artificial infections). F7 generation seeds were sown for self pollination, and simultaneously used in creation of a series of test hybrids in a separate crossing block. F8 generation seed collected in year 4 from a single plant was used to establish all commercial sources for the parent line ZGY-130-1081. All finished and commercial sources of hybrid seed are created using progeny from that individual F8 plant from year 4.

Breeding history for ZGY-130-1005: The original germplasm components used to develop ZGY-130-1005 include Tamino (a hybrid sold by Clause Vegetable Seeds), a landrace collected in the Middle East region prior to 1980 of the white marrow type, a breeding line distributed by Henry Munger from Cornell University (85-187-5X184) in 1986, and a never marketed proprietary hybrid (PSR 1184) green zucchini presently owned by Monsanto Vegetable Seeds.

The initial cross between 85-187-5X184 and the hybrid PSR 1184 was made in year 1. Field notes indicate that the 85-187-5X184 accession was segregating for fruit color, shape, and growth habit, and that seeds were planted individually (indicating that few seeds were available) as opposed to 2-3 seeds/hill with subsequent thinning. Various selections from the accession were used as the male parents in multiple crosses, including crosses to PSR 1184.

The highly variable F1 generation of PSR 1184/(85-187-5X184) was self pollinated during the early spring cycle in year 2, and the F2 progeny were sown. Two F2 individuals from this cross were sib-pollinated, and the progeny from this cross were inoculated with PRSV, and survivors planted in year 3. Multiple crosses were made between elite inbred lines (females) and the individual survivors (males). One of these crosses was with an inbred line derived directly from self pollination of the hybrid known as “Tamino F1” sold by Clause Vegetable Seeds. The F1 generation was then designated as Tamino/(1184/HMMGZZYR), and sown in year 3 for self pollination. The F2-F5 generations were sown in years 4, 5 and 6, respectively, and they were inoculated with a cocktail including ZYMV and/or PRSV, and survivors were self pollinated. The F6 generation was sown in year 7 and was selected for further population development. An F6 selection from the Tamino/(1184/HMMGZZYR) population was used as a female parent in a cross with a landrace known as “white marrow”, and the germplasm was abbreviated to TARHMZ/HP98 (HP98 being the internal name of the white marrow landrace). The F1 generation from this cross was self pollinated in early year 8. The F2 generation was used in a screen with ZYMV inoculation, and survivors were self pollinated. The F3 generation was selected in a screen with a ZYMV and WMV cocktail inoculation in year 9. The F4 generation was planted without inoculation in late year 9, and again self pollinated. F5 generation was sown in year 10 and self pollinated, again without inoculation. The F6 generation was again inoculated with ZYMV and WMV in year 11 to confirm uniformity of resistance, and the self-pollinated selections used to generate the F7. The F7 generation was sown in year 12, and used in self- and cross-pollinations. The F8 generation was sown in year 12, and the progeny bulked to create the finished parental line known as ZGY-130-1005.

B. Physiological and Morphological Characteristics of Squash Hybrid PX 13067464 and Squash Line ZGY 130-1081

In accordance with one aspect of the present invention, there is provided a plant having the physiological and morphological characteristics of squash hybrid PX 13067464 and the parent lines thereof. A description of the physiological and morphological characteristics of such plants is presented in Tables 1-2.

TABLE 1
Physiological and Morphological Characteristics of Hybrid PX 13067464
			Comparison Variety
			Grey Zucchini
	CHARACTERISTIC	PX 13067464	ZGY 47-110
1.	Species	Pepo	Pepo
2.	Kind/Use	squash	squash
3.	Type	summer (vegetable	summer
		marrow)
4.	Cotyledon
	length	61.7 mm	50 mm
	width	32.9 mm	27 mm
	apex	rounded	rounded
	veining	plainly visible	plainly visible
	color	medium green	light green
	color (RHS Color Chart)	137B	137C
5.	Seedling
	shape of cotyledons	elliptic (Cora, Tivoli)	elliptic
	intensity of green color of	medium (Cora)	light
	cotyledons
	cross section of cotyledons	concave	concave
6.	Mature Plant
	growth habit	bush	bush
	plant type	prickly	glabrous
7.	Main Stem
	cross-section shape	round	round
	diameter at mid-point of 1st	31.2 mm	33.4 mm
	internode
	average length	29.4 cm	32.2 cm
	average number of internodes	28.9	32.9
	stem: color	completely green	partly green
		(Becky)
	stem: intensity of green color	dark (Greyzini)	medium
	stem: mottling	present (Cora)	absent
	stem: tendrils	absent to rudimentary	absent to rudimentary
		(Goldrush, Sylvana)
8.	Plant
	growth habit	bush (Greyzini)	bush
	branching	absent (Goldi)	absent
	degree of branching	very weak (Cora)	very weak
	attitude of petiole (excluding	semi-erect (Arlesa)	erect
	lower external leaves)
9.	Leaves
	blade shape	reniform	reniform
	blade form	deep lobed	deep lobed
	margin	denticulate	dentate
	margin edges	frilled	frilled
	average width	35.3 cm	37.00 cm
	average length	28.8 cm	28.9 cm
	leaf surface	smooth	blistered
	dorsal surface pubescence	bristled	soft hairy
	ventral surface pubescence	bristled	soft hairy
	color	dark green	medium green
	color (RHS Color Chart)	147A	137A
	leaf blotching	blotched with gray	blotched with gray
	leaf blade: size	large (Kriti)	medium
	leaf blade: incisions	medium (Jackpot)	medium
	leaf blade: intensity of green	dark (Everest)	medium
	color of upper surface
	leaf blade: silvery patches	present (Civac)	present
	leaf blade: relative area covered	medium (Ambassador)	very large
	by silvery patches
	leaves: petiole length	31.2 cm	25 cm
	petiole: length	long (Autumn Gold,	medium
		Baikal)
	petiole: number of prickles	many (White Bush	medium
		Scallop)
10.	Flower
	pistillate flower: diameter	16.7 cm	14.3 cm
	pistillate flower: ovary	drum-like	drum-like
	pistillate flower: pedicel length	2.1 cm	2.5 cm
	pistillate flower: margin shape	curved	curved
	pistillate flower: margin edges	frilled	plain
	pistillate flower: sepal width	2.7 mm	2 mm
	pistillate flower: sepal length	9.99 mm	6.2 mm
	pistillate flower: color	orange	orange
	pistillate flower: color (RHS	17A	17A
	Color Chart)
	staminate flower: sepal length	16.31 mm	11.3 mm
	staminate flower: sepal width	2.9 mm	7.8 mm
	staminate flower: pedicel length	163.6 mm	141.6 mm
	staminate flower: color	deep yellow	deep yellow
	female flower: ring at inner side	present (Aurore)	present
	of corolla
	female flower: color of ring at	yellow and green	yellow
	inner side of corolla	(Pueble)
	male flower: ring at inner side	present (Goldi)	absent
	of corolla
	male flower: color of ring at	yellow and green
	inner side of corolla	(Alice, Carmina, Green
		Gem, Ibis)
	staminate flower: color (RHS	17A	21A
	Color Chart)
11.	Fruit (at market maturity)
	length	12.9 cm	12.4 cm
	average width - stem end	3.8 cm	3.9 cm
	average width - blossom end	4.2 cm	4.5 cm
	average weight	184.1 gm	174 gm
	shape according to variety type	straight neck	straight neck
	apex	taper pointed	taper pointed
	base	flattened	flattened
	ribs	inconspicuous	inconspicuous
	rib furrow depth	shallow	medium deep
	rib furrow width	narrow	narrow
	fruit surface	smooth	smooth
	warts	none	none
	blossom scar button	raised acron	slightly extended
12.	Young fruit
	general shape	pear shaped (Clarita)	tapered elliptical
	main color of skin (excluding	partly white and partly	green
	color of ribs or grooves)	green
	intensity of green color of skin	medium (Baccara)	dark
	(excluding color of ribs or
	grooves)
13.	Fruit
	general shape	pear shaped	club
	length	medium (Cora)	medium
	maximum diameter	medium (Opal)	large
	ratio length/maximum	medium (Cora)	medium
	diameter
	blossom end	rounded	rounded
	grooves	present	present
	depth of grooves	shallow (Connecticut	very shallow
		Field)
	ribs	present	present
	protrusion of ribs	very weak (Leda,	medium
		Tivoli)
	main color of skin (excluding	partly white and partly	partly white and
	color of dots, patches, stripes	green	partly green
	and bands)
	stripes in grooves	present (Delicata, Heart	absent
		of Gold, Pâtisson jaune
		panaché de vert)
	color of stripes in grooves	dark green (Sweet
		Dumpling)
	color of ribs compared to main	same (Grey Zucchini)	same
	color of skin (excluding color of
	dots, patches, stripes and bands)
	dots	present (Gold Rush,	present
		Table Queen)
	size of main dots	small (Ambassador)	medium
	secondary green color between	absent (Grey Zucchini,	absent
	ribs (excluding dots)	Small Sugar)
	intensity of secondary green	very light
	color between ribs
	warts on skin	absent	absent
	size of flower scar	small (Goldi)	large
	length of peduncle	long (Tivoli)	medium
	color of peduncle	green (Ambassador)	partly yellow and
			partly green
	intensity of green color of	light (Bianchini)	medium
	peduncle
	mottling of peduncle	present (Elite)	present
14.	Ripe fruit
	main color of skin (excluding	yellow (Gold Rush)	orange
	color of mottles, patches, stripes
	and bands)
	intensity of main color of skin	dark	medium
	(only yellow and orange)
	secondary color of skin	cream	cream
	(excluding color of mottles,
	patches, stripes and bands)
	green hue (only white and	present (Amalthee)	absent
	cream)
	prominence of green hue (only	medium (Corona)
	white and cream)
	color of flesh	cream (Elite)	yellow
	lignified rind	present (Elite, Little	present
		Gem, Scallopini,
		Yellow Summer
		Crookneck
	structure of flesh	fibrous (Vegetable	fibrous
		Spaghetti)
15.	Rind
	thickness at medial	4.3 mm	3.3 mm
	toughness	hard	hard
	overall color pattern	regular	regular
	main or ground color	orange-cream	creamy-buff
	main or ground color (RHS	16B	163C
	Color Chart)
	color of streaks	orange-bronze	orange-buff
	color of streaks (RHS Color	17A	163C
	Chart)
	pattern of streaks	not specific	not specific
	color of stripes	bronze-orange
	color of stripes (RHS Color	26D
	Chart)
	pattern of stripes	stem end half
	color of spots	creamy-buff	creamy-buff
	color of spots (RHS Color	160A	158A
	Chart)
	pattern of spots	not specific	not specific
16.	Flesh
	average blossom end thickness	13.9 mm	21.2 mm
	average medial thickness	40.5 mm	45.6 mm
	average stem end thickness	25.6 mm	27.7 mm
	texture (fine, granular, lumpy or	fine	granular
	stringy)
	texture (soft, firm or brittle)	soft	firm
	texture (dry, moist or juicy)	juicy	juicy
	flavor	insipid	insipid
	quality	good	good
	color	whitish-cream	whitish-cream
	color (RHS Color Chart)	155D	11D
17.	Seed Cavity
	length	27.05 cm	23.4 cm
	width	9.3 cm	7.3 cm
	location	conforms to fruit shape	conforms to fruit
			shape
	placental tissue	abundant	moderately abundant
	center core	inconspicuous	inconspicuous
18.	Fruit Stalks
	average length	2.8 cm	3.3 cm
	average diameter	2.3 cm	2.1 cm
	cross-section shape	irregular	irregular
	twisting	not twisted	not twisted
	tapering	not tapered	tapered
	straightness	straight	straight
	texture	spongy	hard
	furrows	deep	deep
	surface	spiny	spiny
	attachment end	expanded	expanded
	detaches	easily	easily
	color	light green	dark green
	color (RHS Color Chart)	138B	146A
19.	Seeds
	average length	15 mm	11.8 mm
	average width	9.3 mm	7.5 mm
	average thickness	1.8 mm	2.8 mm
	face surface	smooth	smooth
	color	cream	cream
	color (RHS Color Chart)	162D	162D
	luster	glossy	dull
	margin	straight	straight
	margin edge	rounded	rounded
	separation from pulp	easy	easy
	average grams per 100 seeds	11.9 gm	10.4 gm
	average number of seeds per	421	246
	fruit
	seed coat	normal	normal
	size	large	large
	shape	broad elliptic (Baby	broad elliptic
		Boo)
	hull	present (Baby Bear,	present
		Elite)
	appearance of hull	fully developed (Elite)	fully developed
	color of hull	cream (De Nice à Fruit	cream
		Rond)
	fruit: type	zucchini
*These are typical values. Values may vary due to environment. Other values that are substantially equivalent are also within the scope of the invention.

TABLE 2
Physiological and Morphological Characteristics of Line ZGY 130-1081
			Comparison Variety
			Grey Zucchini
	CHARACTERISTIC	ZGY 130-1081	ZGY 47-110
1.	Species	Pepo	Pepo
2.	Kind/Use	squash	squash
3.	Type	summer (vegetable	summer
		marrow)
4.	Cotyledon
	length	31.8 mm	50 mm
	width	20.7 mm	27 mm
	veining	prominent	plainly visible
6.	Mature Plant
	growth habit	bush	bush
7.	Main Stem
	diameter at mid-point of 1st	33.4 mm	33.4 mm
	internode
	average length	24.5 cm	32.2 cm
	average number of internodes	14	32.9
	stem: color	completely green	partly green
		(Becky)
	stem: intensity of green color	dark (Greyzini)	medium
	stem: mottling	absent (Cinderella)	absent
	stem: tendrils	absent to rudimentary	absent to rudimentary
		(Goldrush, Sylvana)
8.	Plant
	growth habit	bush (Greyzini)	bush
	branching	absent (Goldi)	absent
	attitude of petiole (excluding	semi-erect to horizontal	erect
	lower external leaves)	(Goldi)
9.	Leaves
	blade shape	reniform	reniform
	blade form	deep lobed	deep lobed
	margin	dentate	dentate
	margin edges	frilled	frilled
	width	35.2 cm	37.00 cm
	length	26 cm	28.9 cm
	leaf surface	blistered	blistered
	color	dark green	medium green
	color (RHS Color Chart)	N164A	137A
	leaf blotching	not blotched	blotched with gray
	leaf blade: size	medium (Ambassador)	medium
	leaf blade: incisions	medium (Jackpot)	medium
	leaf blade: intensity of green	dark (Everest)	medium
	color of upper surface
	leaf blade: silvery patches	absent (Black Forest,	present
		Scallopini)
	leaves: petiole length	26.6 cm	25 cm
	petiole length	medium (Goldi)	medium
	petiole: number of prickles	many (White Bush	medium
		Scallop)
10.	Flower
	pistillate flower: diameter	14.3 cm	14.3 cm
	pistillate flower: pedicel length	1.65 cm	2.5 cm
	pistillate flower: margin shape	curved	curved
	pistillate flower: margin edges	frilled	plain
	pistillate flower: sepal width	11.5 mm	2 mm
	pistillate flower: sepal length	8 mm	6.2 mm
	pistillate flower: color	orange	orange
	pistillate flower: color (RHS	25A	17A
	Color Chart)
	staminate flower: sepal length	18.6 mm	11.3 mm
	staminate flower: sepal width	2.6 mm	7.8 mm
	staminate flower: pedicel length	21.2 mm	141.6 mm
	staminate flower: color	orange	deep yellow
	female flower: ring at inner side	absent (Cinderella,	present
	of corolla	Greyzini)
	male flower: ring at inner side	present (Goldi)	absent
	of corolla
	male flower: color of ring at	yellow (Afrodite, Patro,
	inner side of corolla	Zyzo)
	staminate flower: color (RHS	26A	21A
	Color Chart)
11.	Fruit (at market maturity)
	length	14.4 cm	12.4 cm
	average width - stem end	3.5 cm	3.9 cm
	average width - blossom end	4.5 cm	4.5 cm
	average weight	177.9 gm	174 gm
	shape according to variety type	straight neck	straight neck
	apex	rounded	taper pointed
	base	flattened	flattened
	ribs	none	inconspicuous
	rib furrow depth	shallow	medium deep
	rib furrow width	narrow	narrow
	fruit surface	smooth	smooth
	warts	none	none
	blossom scar button	slightly extended	slightly extended
12.	Young fruit
	ratio length/maximum	medium (Cora)	medium
	diameter
	general shape	tapered cylindrical	tapered elliptical
	main color of skin (excluding	green (Elite, Opal,	green
	color of ribs or grooves)	Romano)
	intensity of green color of skin	light (Arlika)	dark
	(as for 27)
13.	Fruit
	general shape	club shaped	club
	length	medium (Cora)	medium
	maximum diameter	medium (Opal)	large
	ratio length/maximum	medium (Cora)	medium
	diameter
	blossom end	pointed	rounded
	grooves	absent	present
	ribs	present	present
	protrusion of ribs	weak (Ambassador)	medium
	main color of skin (excluding	green (Ambassador,	partly white and
	color of dots, patches, stripes	Baby Bear)	partly green
	and bands)
	intensity of green color of skin	dark (Cora)	medium
	(excluding color of dots,
	patches, stripes and bands)
	stripes in grooves	absent (Baby Bear, Jack	absent
		Be Little)
	color of ribs compared to main	same (Grey Zucchini)	same
	color of skin (excluding color of
	dots, patches, stripes and bands)
	dots	present (Gold Rush,	present
		Table Queen)
	size of main dots	small (Ambassador)	medium
	secondary green color between	absent (Grey Zucchini,	absent
	ribs (excluding dots)	Small Sugar)
	warts on skin	absent	absent
	size of flower scar	medium (Spidi)	large
	length of peduncle	medium (Cinderella)	medium
	color of peduncle	green (Ambassador)	partly yellow and
			partly green
	intensity of green color of	dark (Gold Rush)	medium
	peduncle
	mottling of peduncle	present (Elite)	present
14.	Ripe fruit
	main color of skin (excluding	yellow (Gold Rush)	orange
	color of mottles, patches, stripes
	and bands)
	intensity of main color of skin	light	medium
	(only yellow and orange)
	green hue (only white and	absent (Jedida)	absent
	cream)
	color of flesh	orange (Autumn Gold)	yellow
	lignified rind	absent (Small Sugar,	present
		Table Queen, Vegetable
		Spaghetti)
15.	Rind
	thickness at medial	2.8 mm	3.3 mm
	toughness	hard	hard
	overall color pattern	regular	regular
	main or ground color	yellowish-orange	creamy-buff
	main or ground color (RHS	17B	163C
	Color Chart)
	color of spots	creamy-yellow	creamy-buff
	color of spots (RHS Color	18A	158A
	Chart)
16.	Flesh
	average blossom end thickness	14.2 mm	21.2 mm
	average medial thickness	39.2 mm	45.6 mm
	average stem end thickness	24.8 mm	27.7 mm
	color	yellowish-cream	whitish-cream
	color (RHS Color Chart)	2D	11D
17.	Seed Cavity
	length	24.9 cm	23.4 cm
	width	2 cm	7.3 cm
	location	conforms to fruit shape	conforms to fruit
			shape
	placental tissue	abundant	moderately abundant
	center core	prominent	inconspicuous
18.	Fruit Stalks
	average length	2.8 cm	3.3 cm
	average diameter	2 cm	2.1 cm
	cross-section shape	round	irregular
	twisting	not twisted	not twisted
	tapering	tapered	tapered
	straightness	slightly curved	straight
	furrows	shallow	deep
	surface	rough	spiny
	attachment end	slightly expanded	expanded
	color	dark green	dark green
	color (RHS Color Chart)	133A	146A
19.	Seeds
	average length	15.1 mm	11.8 mm
	average width	9.7 mm	7.5 mm
	average thickness	2.9 mm	2.8 mm
	face surface	smooth	smooth
	color	cream	cream
	color (RHS Color Chart)	155B	162D
	margin	curved	straight
	margin edge	rounded	rounded
	separation from pulp	moderately easy	easy
	average grams per 100 seeds	17 gm	10.4 gm
	average number of seeds per	165	246
	fruit
	seed coat	normal	normal
	size	medium (Diamant)	large
	shape	elliptic (Elite)	broad elliptic
	hull	present (Baby Bear,	present
		Elite)
	appearance of hull	fully developed (Elite)	fully developed
	color of hull	cream (De Nice à Fruit	cream
		Rond)
20.	Additional information
	fruit: type	zucchini
	if zucchini type: fruit: patches,	present (Elite, Greyzini)
	stripes or bands in ripe stage
*These are typical values. Values may vary due to environment. Other values that are substantially equivalent are also within the scope of the invention.

C. Breeding Squash Plants

One aspect of the current invention concerns methods for producing seed of squash hybrid PX 13067464 involving crossing squash lines ZGY 130-1081 and ZGY 130-1005. Alternatively, in other embodiments of the invention, hybrid PX 13067464, or line ZGY 130-1081 may be crossed with itself or with any second plant. Such methods can be used for propagation of hybrid PX 13067464 and/or the squash line ZGY 130-1081, or can be used to produce plants that are derived from hybrid PX 13067464 and/or the squash line ZGY 130-1081. Plants derived from hybrid PX 13067464 and/or the squash line ZGY 130-1081 may be used, in certain embodiments, for the development of new squash varieties.

The development of new varieties using one or more starting varieties is well known in the art. In accordance with the invention, novel varieties may be created by crossing hybrid PX 13067464 followed by multiple generations of breeding according to such well known methods. New varieties may be created by crossing with any second plant. In selecting such a second plant to cross for the purpose of developing novel lines, it may be desired to choose those plants which either themselves exhibit one or more selected desirable characteristics or which exhibit the desired characteristic(s) when in hybrid combination. Once initial crosses have been made, inbreeding and selection take place to produce new varieties. For development of a uniform line, often five or more generations of selfing and selection are involved.

Uniform lines of new varieties may also be developed by way of double-haploids. This technique allows the creation of true breeding lines without the need for multiple generations of selfing and selection. In this manner true breeding lines can be produced in as little as one generation. Haploid embryos may be produced from microspores, pollen, anther cultures, or ovary cultures. The haploid embryos may then be doubled autonomously, or by chemical treatments (e.g. colchicine treatment). Alternatively, haploid embryos may be grown into haploid plants and treated to induce chromosome doubling. In either case, fertile homozygous plants are obtained. In accordance with the invention, any of such techniques may be used in connection with a plant of the invention and progeny thereof to achieve a homozygous line.

Backcrossing can also be used to improve an inbred plant. Backcrossing transfers a specific desirable trait from one inbred or non-inbred source to an inbred that lacks that trait. This can be accomplished, for example, by first crossing a superior inbred (A) (recurrent parent) to a donor inbred (non-recurrent parent), which carries the appropriate locus or loci for the trait in question. The progeny of this cross are then mated back to the superior recurrent parent (A) followed by selection in the resultant progeny for the desired trait to be transferred from the non-recurrent parent. After five or more backcross generations with selection for the desired trait, the progeny have the characteristic being transferred, but are like the superior parent for most or almost all other loci. The last backcross generation would be selfed to give pure breeding progeny for the trait being transferred.

The plants of the present invention are particularly well suited for the development of new lines based on the elite nature of the genetic background of the plants. In selecting a second plant to cross with PX 13067464 and/or squash line ZGY 130-1081 for the purpose of developing novel squash lines, it will typically be preferred to choose those plants which either themselves exhibit one or more selected desirable characteristics or which exhibit the desired characteristic(s) when in hybrid combination. Examples of desirable traits may include, in specific embodiments, high seed yield, high seed germination, seedling vigor, high fruit yield, disease tolerance or resistance, and adaptability for soil and climate conditions. Consumer-driven traits, such as a fruit shape, color, texture, and taste are other examples of traits that may be incorporated into new lines of squash plants developed by this invention.

D. Performance Characteristics

As described above, hybrid PX 13067464 exhibits desirable agronomic traits. The performance characteristics of hybrid PX 13067464 were the subject of an objective analysis of the performance traits relative to other varieties. The results of the analysis are presented below.

TABLE 3
Average Performance Characteristics For Hybrid PX 13067464 and Comparison
Hybrids across multiple seasons and environments
												DTM
	YSFHP	PLTVG	MFUNF	IFCLR	EARLY	BES	SPINE	SBA	FREHR	PLHAB	PMPX	Adjusted	OYLOS	VSEV
Depredador	4	2	3	4	4	4	6	3	5	7	6	52	4	3
Grey Zucchini	6	6	5	5	5	6	5	4	3	5	8	51	6	8
PX 13067464	4	3	4	4	4	3	5	3	5	5	5	50	3	3
Terminator	4	3	4	4	5	6	6	5	5	6	7	51	4	4
Lolita	4	6	3	4	5	6	5	5	4	5	7	51	6	7
YFSHP-young fruit shape, scale of 1 to 9
PLTVG-plant vigor, scale of 1 to 9
MFUNF-marketable fruit uniformity, scale of 1 to 9
IFCLR-uniformity and appropriateness of fruit color at marketable (immature) stage, 1-9 scale
EARLY-earliness, scale of 1 to 9
BES-blossom end scar size, scale of 1 to 9
SPINE-level of spininess on plant, scale of 1 to 9
SBA-silvering disease reaction to feeding by Bemisia argentifolii, scale of 1 to 9
FREHR-fruit ease of harvest; how well the fruit twists off the plant, if it breaks in the fruit or at the stem, scale of 1 to 9
PLHAB-plant growth habit desirability, scale of 1 to 9
PMPX-powdery mildew resistance, scale of 1 to 9
DTM Adjusted-Days to Maturity, adjusted to a field average of 50 days
OYLOS-objective yield score, scale of 1 to 9, adjusted to field average of 5
VSEV-viral severity rating, from locations with pressure and ratings, scale of 1 to 9

E. Further Embodiments of the Invention

In certain aspects of the invention, plants described herein are provided modified to include at least a first desired heritable trait. Such plants may, in one embodiment, be developed by a plant breeding technique called backcrossing, wherein essentially all of the morphological and physiological characteristics of a variety are recovered in addition to a genetic locus transferred into the plant via the backcrossing technique. The term single locus converted plant as used herein refers to those squash plants which are developed by a plant breeding technique called backcrossing, wherein essentially all of the morphological and physiological characteristics of a variety are recovered in addition to the single locus transferred into the variety via the backcrossing technique. By essentially all of the morphological and physiological characteristics, it is meant that the characteristics of a plant are recovered that are otherwise present when compared in the same environment, other than an occasional variant trait that might arise during backcrossing or direct introduction of a transgene.

Backcrossing methods can be used with the present invention to improve or introduce a characteristic into the present variety. The parental squash plant which contributes the locus for the desired characteristic is termed the nonrecurrent or donor parent. This terminology refers to the fact that the nonrecurrent parent is used one time in the backcross protocol and therefore does not recur. The parental squash plant to which the locus or loci from the nonrecurrent parent are transferred is known as the recurrent parent as it is used for several rounds in the backcrossing protocol.

In a typical backcross protocol, the original variety of interest (recurrent parent) is crossed to a second variety (nonrecurrent parent) that carries the single locus of interest to be transferred. The resulting progeny from this cross are then crossed again to the recurrent parent and the process is repeated until a squash plant is obtained wherein essentially all of the morphological and physiological characteristics of the recurrent parent are recovered in the converted plant, in addition to the single transferred locus from the nonrecurrent parent.

The selection of a suitable recurrent parent is an important step for a successful backcrossing procedure. The goal of a backcross protocol is to alter or substitute a single trait or characteristic in the original variety. To accomplish this, a single locus of the recurrent variety is modified or substituted with the desired locus from the nonrecurrent parent, while retaining essentially all of the rest of the desired genetic, and therefore the desired physiological and morphological constitution of the original variety. The choice of the particular nonrecurrent parent will depend on the purpose of the backcross; one of the major purposes is to add some commercially desirable trait to the plant. The exact backcrossing protocol will depend on the characteristic or trait being altered and the genetic distance between the recurrent and nonrecurrent parents. Although backcrossing methods are simplified when the characteristic being transferred is a dominant allele, a recessive allele, or an additive allele (between recessive and dominant), may also be transferred. In this instance it may be necessary to introduce a test of the progeny to determine if the desired characteristic has been successfully transferred.

In one embodiment, progeny squash plants of a backcross in which a plant described herein is the recurrent parent comprise (i) the desired trait from the non-recurrent parent and (ii) all of the physiological and morphological characteristics of squash the recurrent parent as determined at the 5% significance level when grown in the same environmental conditions.

New varieties can also be developed from more than two parents. The technique, known as modified backcrossing, uses different recurrent parents during the backcrossing. Modified backcrossing may be used to replace the original recurrent parent with a variety having certain more desirable characteristics or multiple parents may be used to obtain different desirable characteristics from each.

Many single locus traits have been identified that are not regularly selected for in the development of a new inbred but that can be improved by backcrossing techniques. Single locus traits may or may not be transgenic; examples of these traits include, but are not limited to, herbicide resistance, resistance to bacterial, fungal, or viral disease, insect resistance, modified fatty acid or carbohydrate metabolism, and altered nutritional quality. These comprise genes generally inherited through the nucleus.

Direct selection may be applied where the single locus acts as a dominant trait. For this selection process, the progeny of the initial cross are assayed for viral resistance and/or the presence of the corresponding gene prior to the backcrossing. Selection eliminates any plants that do not have the desired gene and resistance trait, and only those plants that have the trait are used in the subsequent backcross. This process is then repeated for all additional backcross generations.

Selection of squash plants for breeding is not necessarily dependent on the phenotype of a plant and instead can be based on genetic investigations. For example, one can utilize a suitable genetic marker which is closely genetically linked to a trait of interest. One of these markers can be used to identify the presence or absence of a trait in the offspring of a particular cross, and can be used in selection of progeny for continued breeding. This technique is commonly referred to as marker assisted selection. Any other type of genetic marker or other assay which is able to identify the relative presence or absence of a trait of interest in a plant can also be useful for breeding purposes. Procedures for marker assisted selection are well known in the art. Such methods will be of particular utility in the case of recessive traits and variable phenotypes, or where conventional assays may be more expensive, time consuming or otherwise disadvantageous. Types of genetic markers which could be used in accordance with the invention include, but are not necessarily limited to, Simple Sequence Length Polymorphisms (SSLPs) (Williams et al., 1990), Randomly Amplified Polymorphic DNAs (RAPDs), DNA Amplification Fingerprinting (DAF), Sequence Characterized Amplified Regions (SCARs), Arbitrary Primed Polymerase Chain Reaction (AP-PCR), Amplified Fragment Length Polymorphisms (AFLPs) (EP 534 858, specifically incorporated herein by reference in its entirety), and Single Nucleotide Polymorphisms (SNPs) (Wang et al., 1998).

F. Plants Derived by Genetic Engineering

Many useful traits that can be introduced by backcrossing, as well as directly into a plant, are those which are introduced by genetic transformation techniques. Genetic transformation may therefore be used to insert a selected transgene into a plant of the invention or may, alternatively, be used for the preparation of transgenes which can be introduced by backcrossing. Methods for the transformation of plants that are well known to those of skill in the art and applicable to many crop species include, but are not limited to, electroporation, microprojectile bombardment, Agrobacterium-mediated transformation and direct DNA uptake by protoplasts.

To effect transformation by electroporation, one may employ either friable tissues, such as a suspension culture of cells or embryogenic callus or alternatively one may transform immature embryos or other organized tissue directly. In this technique, one would partially degrade the cell walls of the chosen cells by exposing them to pectin-degrading enzymes (pectolyases) or mechanically wound tissues in a controlled manner.

An efficient method for delivering transforming DNA segments to plant cells is microprojectile bombardment. In this method, particles are coated with nucleic acids and delivered into cells by a propelling force. Exemplary particles include those comprised of tungsten, platinum, and preferably, gold. For the bombardment, cells in suspension are concentrated on filters or solid culture medium. Alternatively, immature embryos or other target cells may be arranged on solid culture medium. The cells to be bombarded are positioned at an appropriate distance below the macroprojectile stopping plate.

An illustrative embodiment of a method for delivering DNA into plant cells by acceleration is the Biolistics Particle Delivery System, which can be used to propel particles coated with DNA or cells through a screen, such as a stainless steel or Nytex screen, onto a surface covered with target cells. The screen disperses the particles so that they are not delivered to the recipient cells in large aggregates. Microprojectile bombardment techniques are widely applicable, and may be used to transform virtually any plant species.

Agrobacterium-mediated transfer is another widely applicable system for introducing gene loci into plant cells. An advantage of the technique is that DNA can be introduced into whole plant tissues, thereby bypassing the need for regeneration of an intact plant from a protoplast. Modern Agrobacterium transformation vectors are capable of replication in E. coli as well as Agrobacterium, allowing for convenient manipulations (Klee et al., 1985). Moreover, recent technological advances in vectors for Agrobacterium-mediated gene transfer have improved the arrangement of genes and restriction sites in the vectors to facilitate the construction of vectors capable of expressing various polypeptide coding genes. The vectors described have convenient multi-linker regions flanked by a promoter and a polyadenylation site for direct expression of inserted polypeptide coding genes. Additionally, Agrobacterium containing both armed and disarmed Ti genes can be used for transformation.

In those plant strains where Agrobacterium-mediated transformation is efficient, it is the method of choice because of the facile and defined nature of the gene locus transfer. The use of Agrobacterium-mediated plant integrating vectors to introduce DNA into plant cells is well known in the art (Fraley et al., 1985; U.S. Pat. No. 5,563,055).

Transformation of plant protoplasts also can be achieved using methods based on calcium phosphate precipitation, polyethylene glycol treatment, electroporation, and combinations of these treatments (see, e.g., Potrykus et al., 1985; Omirulleh et al., 1993; Fromm et al., 1986; Uchimiya et al., 1986; Marcotte et al., 1988). Transformation of plants and expression of foreign genetic elements is exemplified in Choi et al. (1994), and Ellul et al. (2003).

A number of promoters have utility for plant gene expression for any gene of interest including but not limited to selectable markers, scoreable markers, genes for pest tolerance, disease resistance, nutritional enhancements and any other gene of agronomic interest. Examples of constitutive promoters useful for plant gene expression include, but are not limited to, the cauliflower mosaic virus (CaMV) P-35S promoter, which confers constitutive, high-level expression in most plant tissues (see, e.g., Odel et al., 1985), including in monocots (see, e.g., Dekeyser et al., 1990; Terada and Shimamoto, 1990); a tandemly duplicated version of the CaMV 35S promoter, the enhanced 35S promoter (P-e35S); 1 the nopaline synthase promoter (An et al., 1988); the octopine synthase promoter (Fromm et al., 1989); and the figwort mosaic virus (P-FMV) promoter as described in U.S. Pat. No. 5,378,619 and an enhanced version of the FMV promoter (P-eFMV) where the promoter sequence of P-FMV is duplicated in tandem; the cauliflower mosaic virus 19S promoter; a sugarcane bacilliform virus promoter; a commelina yellow mottle virus promoter; and other plant DNA virus promoters known to express in plant cells.

A variety of plant gene promoters that are regulated in response to environmental, hormonal, chemical, and/or developmental signals can also be used for expression of an operably linked gene in plant cells, including promoters regulated by (1) heat (Callis et al., 1988), (2) light (e.g., pea rbcS-3A promoter, Kuhlemeier et al., 1989; maize rbcS promoter, Schaffner and Sheen, 1991; or chlorophyll a/b-binding protein promoter, Simpson et al., 1985), (3) hormones, such as abscisic acid (Marcotte et al., 1989), (4) wounding (e.g., wunl, Siebertz et al., 1989); or (5) chemicals such as methyl jasmonate, salicylic acid, or Safener. It may also be advantageous to employ organ-specific promoters (e.g., Roshal et al., 1987; Schernthaner et al., 1988; Bustos et al., 1989).

Exemplary nucleic acids which may be introduced to plants of this invention include, for example, DNA sequences or genes from another species, or even genes or sequences which originate with or are present in the same species, but are incorporated into recipient cells by genetic engineering methods rather than classical reproduction or breeding techniques. However, the term “exogenous” is also intended to refer to genes that are not normally present in the cell being transformed, or perhaps simply not present in the form, structure, etc., as found in the transforming DNA segment or gene, or genes which are normally present and that one desires to express in a manner that differs from the natural expression pattern, e.g., to over-express. Thus, the term “exogenous” gene or DNA is intended to refer to any gene or DNA segment that is introduced into a recipient cell, regardless of whether a similar gene may already be present in such a cell. The type of DNA included in the exogenous DNA can include DNA which is already present in the plant cell, DNA from another plant, DNA from a different organism, or a DNA generated externally, such as a DNA sequence containing an antisense message of a gene, or a DNA sequence encoding a synthetic or modified version of a gene.

Many hundreds if not thousands of different genes are known and could potentially be introduced into a squash plant according to the invention. Non-limiting examples of particular genes and corresponding phenotypes one may choose to introduce into a squash plant include one or more genes for insect tolerance, such as a Bacillus thuringiensis (B.t.) gene, pest tolerance such as genes for fungal disease control, herbicide tolerance such as genes conferring glyphosate tolerance, and genes for quality improvements such as yield, nutritional enhancements, environmental or stress tolerances, or any desirable changes in plant physiology, growth, development, morphology or plant product(s). For example, structural genes would include any gene that confers insect tolerance including but not limited to a Bacillus insect control protein gene as described in WO 99/31248, herein incorporated by reference in its entirety, U.S. Pat. No. 5,689,052, herein incorporated by reference in its entirety, U.S. Pat. Nos. 5,500,365 and 5,880,275, herein incorporated by reference in their entirety. In another embodiment, the structural gene can confer tolerance to the herbicide glyphosate as conferred by genes including, but not limited to Agrobacterium strain CP4 glyphosate resistant EPSPS gene (aroA:CP4) as described in U.S. Pat. No. 5,633,435, herein incorporated by reference in its entirety, or glyphosate oxidoreductase gene (GOX) as described in U.S. Pat. No. 5,463,175, herein incorporated by reference in its entirety.

Alternatively, the DNA coding sequences can affect these phenotypes by encoding a non-translatable RNA molecule that causes the targeted inhibition of expression of an endogenous gene, for example via antisense- or cosuppression-mediated mechanisms (see, for example, Bird et al., 1991). The RNA could also be a catalytic RNA molecule (i.e., a ribozyme) engineered to cleave a desired endogenous mRNA product (see for example, Gibson and Shillito, 1997). Thus, any gene which produces a protein or mRNA which expresses a phenotype or morphology change of interest is useful for the practice of the present invention.

G. Definitions

In the description and tables herein, a number of terms are used. In order to provide a clear and consistent understanding of the specification and claims, the following definitions are provided:

Allele: Any of one or more alternative forms of a gene locus, all of which alleles relate to one trait or characteristic. In a diploid cell or organism, the two alleles of a given gene occupy corresponding loci on a pair of homologous chromosomes.

Backcrossing: A process in which a breeder repeatedly crosses hybrid progeny, for example a first generation hybrid (F₁), back to one of the parents of the hybrid progeny. Backcrossing can be used to introduce one or more single locus conversions from one genetic background into another.

Crossing: The mating of two parent plants.

Cross-pollination: Fertilization by the union of two gametes from different plants.

Diploid: A cell or organism having two sets of chromosomes.

Emasculate: The removal of plant male sex organs or the inactivation of the organs with a cytoplasmic or nuclear genetic factor or a chemical agent conferring male sterility.

Enzymes: Molecules which can act as catalysts in biological reactions.

F₁ Hybrid: The first generation progeny of the cross of two nonisogenic plants.

Genotype: The genetic constitution of a cell or organism.

Haploid: A cell or organism having one set of the two sets of chromosomes in a diploid.

Linkage: A phenomenon wherein alleles on the same chromosome tend to segregate together more often than expected by chance if their transmission was independent.

Marker: A readily detectable phenotype, preferably inherited in codominant fashion (both alleles at a locus in a diploid heterozygote are readily detectable), with no environmental variance component, i.e., heritability of 1.

Phenotype: The detectable characteristics of a cell or organism, which characteristics are the manifestation of gene expression.

Quantitative Trait Loci (QTL): Quantitative trait loci (QTL) refer to genetic loci that control to some degree numerically representable traits that are usually continuously distributed.

Resistance: As used herein, the terms “resistance” and “tolerance” are used interchangeably to describe plants that show no symptoms to a specified biotic pest, pathogen, abiotic influence or environmental condition. These terms are also used to describe plants showing some symptoms but that are still able to produce marketable product with an acceptable yield. Some plants that are referred to as resistant or tolerant are only so in the sense that they may still produce a crop, even though the plants are stunted and the yield is reduced.

Regeneration: The development of a plant from tissue culture.

Royal Horticultural Society (RHS) color chart value: The RHS color chart is a standardized reference which allows accurate identification of any color. A color's designation on the chart describes its hue, brightness and saturation. A color is precisely named by the RHS color chart by identifying the group name, sheet number and letter, e.g., Yellow-Orange Group 19A or Red Group 41B.

Self-pollination: The transfer of pollen from the anther to the stigma of the same plant.

Single Locus Converted (Conversion) Plant: Plants which are developed by a plant breeding technique called backcrossing, wherein essentially all of the morphological and physiological characteristics of a squash variety are recovered in addition to the characteristics of the single locus transferred into the variety via the backcrossing technique and/or by genetic transformation.

Substantially Equivalent: A characteristic that, when compared, does not show a statistically significant difference (e.g., p=0.05) from the mean.

Tissue Culture: A composition comprising isolated cells of the same or a different type or a collection of such cells organized into parts of a plant.

Transgene: A genetic locus comprising a sequence which has been introduced into the genome of a squash plant by transformation.

H. Deposit Information

A deposit of squash hybrid PX 13067464 and inbred parent line ZGY 130-1081, disclosed above and recited in the claims, has been made with the American Type Culture Collection (ATCC), 10801 University Blvd., Manassas, Va. 20110-2209. The date of the deposits were Jan. 26, 2010. The accession numbers for those deposited seeds of squash hybrid PX 13067464 and inbred parent line ZGY 130-1081 are ATCC Accession Number PTA-10618 and ATCC Accession Number PTA-10619, respectively. Upon issuance of a patent, all restrictions upon the deposits will be removed, and the deposits are intended to meet all of the requirements of 37 C.F.R. §1.801-1.809. The deposits will be maintained in the depository for a period of 30 years, or 5 years after the last request, or for the effective life of the patent, whichever is longer, and will be replaced if necessary during that period.

Although the foregoing invention has been described in some detail by way of illustration and example for purposes of clarity and understanding, it will be obvious that certain changes and modifications may be practiced within the scope of the invention, as limited only by the scope of the appended claims.

All references cited herein are hereby expressly incorporated herein by reference.

REFERENCES

The following references, to the extent that they provide exemplary procedural or other details supplementary to those set forth herein, are specifically incorporated herein by reference:

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Claims

1. A squash plant comprising at least a first set of the chromosomes of squash line zgy 130-1081, a sample of seed of said line having been deposited under ATCC Accession No. PTA-10619.

2. A seed comprising at least a first set of the chromosomes of squash line zgy 130-1081, a sample of seed of said line having been deposited under ATCC Accession No. PTA-10619.

3. The plant of claim 1, which is hybrid.

4. The plant of claim 3, wherein the hybrid plant is squash hybrid px 13067464, a sample of seed of said hybrid having been deposited under ATCC Accession No. PTA-10618.

5. A plant part of the plant of claim 1.

6. The plant part of claim 5, further defined as a leaf, a ovule, pollen, a fruit, or a cell.

7. The plant part of claim 6, further defined as a fruit.

8. A squash plant, or a part thereof, having all the physiological and morphological characteristics of the squash plant of claim 4.

9. A squash plant, or a part thereof, having all the physiological and morphological characteristics of the squash plant of claim 4.

10. A tissue culture of regenerable cells of the plant of claim 1.

11. The tissue culture according to claim 10, comprising cells or protoplasts from a plant part selected from the group consisting of embryos, meristems, cotyledons, pollen, leaves, anthers, roots, root tips, pistil, flower, seed and stalks.

12. A squash plant regenerated from the tissue culture of claim 11.

13. A method of vegetatively propagating the plant of claim 1, said method comprising the steps of:

(a) obtaining tissue capable of being propagated from a plant according to claim 1;

(b) cultivating said tissue to obtain proliferated shoots; and

(c) rooting said proliferated shoots to obtain rooted plantlets.

14. The method of claim 13, further comprising growing plants from said rooted plantlets.

15. A method of introducing a desired trait into a squash line, said method comprising:

(a) crossing a plant of line zgy 130-1081, a sample of seed of said line having been deposited under ATCC Accession No. PTA-10619, with a second squash plant that comprises a desired trait to produce f1 progeny;

(b) selecting an f1 progeny that comprises the desired trait;

(c) crossing the selected f1 progeny with a plant of line zgy 130-1081 to produce backcross progeny; and

(d) repeating steps (b) and (c) three or more times to produce selected fourth or higher backcross progeny that comprise the desired trait.

16. A squash plant produced by the method of claim 15.

17. A method of producing a plant comprising a transgene, the method comprising introducing a transgene into a plant of squash hybrid px 13067464 or squash line zgy 130-1081, a sample of seed of said hybrid and line having been deposited under ATCC Accession No. PTA-10618 and ATCC Accession No. PTA-10619, respectively.

18. A plant of squash hybrid px 13067464 or squash line zgy 130-1081 further comprising a transgene, a sample of seed of said hybrid and line having been deposited under ATCC Accession No. PTA-10618 and ATCC Accession No. PTA-10619, respectively.

19. A seed that produces the plant of claim 18.

20. A plant produced by introducing a single locus conversion into a plant of squash hybrid px 13067464 or squash line zgy 130-1081, a sample of seed of said hybrid and line having been deposited under ATCC Accession No. PTA-10618 and ATCC Accession No. PTA-10619, respectively.

21. A seed that produces the plant of claim 20.

22. A method for producing a seed of a plant derived from hybrid px 13067464 or line zgy 130-1081, said method comprising the steps of:

(a) crossing a squash plant of hybrid px 13067464 or line zgy 130-1081 with a second squash plant; a sample of seed of said hybrid and line having been deposited under ATCC Accession No. PTA-10618 and ATCC Accession No. PTA-10619, respectively; and

(b) allowing seed of a hybrid px 13067464 or line zgy 130-1081-derived squash plant to form.

23. The method of claim 22, further comprising the steps of:

(c) crossing a plant grown from said hybrid px 13067464 or zgy 130-1081-derived squash seed with itself or a second squash plant to yield additional hybrid px 13067464 or zgy 130-1081-derived squash seed;

(d) growing said additional hybrid px 13067464 or zgy 130-1081-derived squash seed of step (c) to yield additional hybrid px 13067464 or zgy 130-1081-derived squash plants; and

(e) repeating the crossing and growing steps of (c) and (d) to generate at least a first further hybrid px 13067464 or zgy 130-1081-derived squash plant.

24. The method of claim 22, wherein the second squash plant is of an inbred squash line.

25. The method of claim 23, further comprising:

(f) crossing the further hybrid px 13067464 or zgy 130-1081-derived squash plant with a second squash plant to produce seed of a hybrid progeny plant.

26. A method of producing a squash, said method comprising:

(a) obtaining a plant according to claim 1, wherein the plant has been cultivated to maturity; and

(b) collecting a squash from the plant.

27. The method of claim 26, wherein the plant is a plant of squash hybrid px 13067464, a sample of seed of said hybrid px 13067464 having been deposited under ATCC Accession No. PTA-10618.

28. A method of producing seed, said method comprising crossing the plant of claim 1 with itself or a second plant.